Plug and receptacle

Abstract

A plug includes: a plug frame portion having a cylindrical shape; a header portion for being housed in the plug frame portion; a pair of lock arms supported on the plug frame portion; and a plug shutter for moving back and forth in the inserting/extracting directions. Each of the paired lock arms includes: a body extending toward the receptacle; a hook portion formed on the forward end side of the body; and an action member formed closer to the rearward end side than the hook portion. The plug shutter includes: a cylindrical shutter frame portion; a pair of lever portions; and a pair of projections. When the plug shutter is moved backward of the receptacle by holding the lever portions with the fingers, the projections of the plug shutter push the action members of the lock arms inward to deform the lock arms inward thereby to move the hook portions of the lock arms inward.

1. A plug for being inserted into the opening of a receptacle, wherein said receptacle includes a recess in the inner wall of said opening, said plug comprises:
 an insulating plug frame portion having a cylindrical shape;  
 an insulating header portion of a flat plate shape for being housed in said plug frame portion and exposed at its forward end to said receptacle;  
 a pair of lock arms supported on the both side faces of said plug frame portion; and  
 an insulating plug shutter for moving back and forth in the inserting/extracting directions with respect to said plug frame portion,  
 wherein said header portion has a forward end for being inserted into the opening of said receptacle and includes contacts juxtaposed on its two faces,  
 wherein each of said paired lock arms includes: a body extending toward said receptacle; a hook portion formed on the forward end side of said body and protruding from said plug frame portion for engaging in the recess of said receptacle; and an action member formed closer to the rearward end side than said hook portion, and  
 wherein said plug shutter includes: a cylindrical shutter frame portion for covering said header portion; a pair of lever portions formed on the both side faces of said shutter frame portion and protruding from said plug frame portion; and a pair of projections formed on the both side faces of said shutter frame portion and disposed to confront said lock arms individually,  
 whereby when said plug shutter is moved backward of said receptacle by holding said lever portions with the fingers, the projections of said plug shutter push the action members of said lock arms inward to elastically deform said lock arms inward thereby to move the hook portions of said lock arms inward.  
 
   
   
     2. A plug according to  claim 1 , further comprising:
 elastic members for urging said plug shutter toward said receptacle.  
 
   
   
     3. A plug according to  claim 2 , wherein said hook portions are individually formed to have a generally triangular section becoming thinner toward the forward ends, and
 wherein the faces on the rearward end sides of said hook portions intersect the inserting/extracting directions of said plug.  
 
   
   
     4. A plug according to any one of  claims 1  to  3 , wherein said shutter frame portion covers said header portion, when said plug shutter moves forward, and exposes said header portion when said plug shutter moves backward. 
   
   
     5. A plug according to any one of  claims 1  to  3 , further comprising:
 a printed-circuit board for being connected to the rearward end sides of said contacts.  
 
   
   
     6. A plug according to any one of  claims 1  to  3 , further comprising:
 a first shell made of a metal sheet for enveloping said plug frame portion and said header portion.  
 
   
   
     7. A plug according to  claim 6 , further comprising:
 a cylindrical metal cover for covering said printed-circuit board; and  
 a cable shielding clamp for shielding said metal cover.  
 
   
   
     8. A receptacle having an opening into which a plug is inserted, said receptacle comprises:
 a recess in the inner wall of said opening,  
 wherein said plug includes: an insulating plug frame portion having a cylindrical shape; an insulating header portion of a flat plate shape for being housed in said plug frame portion and exposed at its forward end to said receptacle; a pair of lock arms supported on the both side faces of said plug frame portion; and an insulating plug shutter for moving back and forth in the inserting/extracting directions with respect to said plug frame portion,  
 wherein said header portion has a forward end for being inserted into the opening of said receptacle and includes contacts juxtaposed on its two faces,  
 wherein each of said paired lock arms includes: a body extending toward said receptacle; a hook portion formed on the forward end side of said body and protruding from said plug frame portion for engaging in the recess of said receptacle; and an action member formed on the rearward end side closer than said hook portion, and  
 wherein said plug shutter includes: a cylindrical shutter frame portion for covering said header portion; a pair of lever portions formed on the both side faces of said shutter frame portion and protruding from said plug frame portion; and a pair of projections formed on the both side faces of said shutter frame portion and disposed to confront said lock arms individually,  
 whereby when said plug shutter is moved backward of said receptacle by holding said lever portions with the fingers, the projections of said plug shutter push the action members of said lock arms inward to elastically deform said lock arms inward thereby to move the hook portions of said lock arms inward.  
 
   
   
     9. A receptacle according to  claim 8 , wherein said opening is enveloped at its edges with a second shell made of a metal.